Fix #376: Output `m2t` from `getAxisOptions`
Fix #376: Output `m2t` from `getAxisOptions`

This is needed to handle custom color definitions in axis options.

Note that `m2t` is returned before `opts` such that it is inconvenient to
get the `opts` without `m2t`.

matlab2tikz/matlab2tikz,matlab2tikz/matlab2tikz,egeerardyn/matlab2tikz,okomarov/matlab2tikz,miscco/matlab2tikz,okomarov/matlab2tikz,PeterPablo/matlab2tikz,egeerardyn/matlab2tikz,RPeschke/matlab2tikz,LJeub/matlab2tikz,nidrosianDeath/matlab2tikz